Add support to load log4rs config file

log-cfg.yml

@@ -0,0 +1,39 @@
+appenders:
+  stdout:
+    kind: console
+    encoder:
+      pattern: "{m}{n}"
+  requests:
+    kind: rolling_file
+    path: "log/requests.log"
+    encoder:
+      pattern: "{d} - {m}{n}"
+    policy:
+      kind: compound
+      trigger:
+        kind: size
+        limit: 1mb
+      roller:
+        kind: fixed_window
+        base: 1
+        count: 5
+        pattern: "logs/requests.{}.log"
+root:
+  level: info
+  appenders:
+    - stdout
+loggers:
+  html5ever::tree_builder:
+    level: warn
+  html5ever::tokenizer:
+    level: warn
+  html5ever::tokenizer::char_ref:
+    level: warn
+  reqwest::connect:
+    level: warn
+  server:
+    level: info
+    appenders:
+      - requests
+    additive: false
+